It's easy and convenient to obtain articles, blog posts, etc. via ID as query string. But the page generated with ID paramater has less of a chance of being indexed by search engine. Instead of ID, use a more search-engine-friendly name in the URL.

You don't want to show ads from adsense while you are testing your site. This will inflate your adsense numbers and there is a chance of you accidentally clicking on one of the ads. Google does not allow you clicking on ads shown on your site. This article shows how to be safe and not show ads while testing.

RewritePath used to service search engine friendly urls has problems with search engines. While this works fine with regular browsers, the request fails with the user agents of most all search engines. This article looks at the workarounds (fix from Microsoft was not available by early 2007)